Grinding-machine.



No. 820,193, PATENTBD MAY 8, 1906.

v H. A. HIGBEE.

GRINDING MACHIN.

' APPLICATION FILED JULYB. 1904.

3 SHEETS-SHEET 1.

Il l lll III I Nb. 820,193. PATENTED MAY s, 1906.

H. A. HIGBEE. GRNDING MACHINE.

APPLIGATION-IILBD JULY 8. 1904.

. 3 SHEETS-SHEET 2.

6MM tu aan atbo'anu mnnzw n. Gamm ce., Pham-mussxuwsns wA'smNGmn. n. c.

PATENTED MAYS, 1906.

H. A. H'IGBEE. GRINDING MACHINE.

' APPLIOATIONYPILBD JULY8,1904.

3 SHEETS-SHEET 3.

WI mnumlwillmll HI..

.SMH

UNTTED sTATEs PATENT oEEIoE.

HARRIET A. HIGBEE, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO HENRY D. PERKY, OF GLENCOE, MARYLAND.'

GRlNDlNG-MACHINE.

Specification of Letters Patent;

.ratentea May 8, 1906.

To LZZ whom, it may concern:

Be it known that 1, HARRIET A. HIGBEE, a citizen of the United States, and a resident of Worcester, in the county of Worcester and State of Massachusetts, have made a certain new and useful Invention in Grinding-Machines; and 1 declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it ap ertains to make and use the invention, re erence being had to the accompanying drawings, and to letters and figures of reference marked thereon, which form a part of this specification.

Figure l is a vertical central section. Fig. 2 is a horizontal section. Fig. 3 is a detail of the feed, side view. Fig. 4 is a detail of the feed, top view. Fig. 5 is a sectional view of upper bowl portion. Fig. 6 is a side view of lower grinding-plate. Fig. 7 is a bottom view of the same.

The invention has relation to grinding-machines chiefly designed for the purpose of rcducing grain; and the invention consists in the novel construction and combinations of parts, as hereinafter set forth.

1n the accompanying drawings, illustrating the invention, the letter c designates the frame of the machine, having at or near its upper portion a diaphragm b and lower down, usually near its middle portion, supporting-lugs '0, which are provided with threaded perforations for the reception of the adjustable screw-bearings d.

The diaphragm b is provided with a central depending cylindrical barrel c, in which is located the vertical bearing f, usually of Babbitt metal, the lower end g of which projects downward to receive the central opening h of the spider-form top 7c of the upper portion of the bowl, which is provided with the lower or concave grinding-plate m. This portion p of the bowl is provided with an annular shoulder n at the bottom of its concave wall r, said shoulder facing downward to engage the rim-face of the concave grindingplate m, which forms the lower portion of the bowl. This grinding-plate is provided with exterior lugs s, designed to engage the interior lugs ,t of the bowl-flange w, the lugs of both plate and flange having intervals between them of suiiicient extent to permit the grinding-plate to be removed downward or through the open bottom of the main frame when the lugs are disengaged. The upper portion of the bowl, which rests on the screwbearings d, is also designed to be removable in a similar manner. The diaphragm b is provided with an opening u near'its periphery for the introduction of a feed-tube v. A bearing 2 is provided in the frame-wall for the journal of the pinion 3, which engages the wheel 4, which is secured to the upper end of the bent shaft z, the vertical portion of which rotates in the vertical central bearing f. The lower end of the shaft z is inclined to the prolongation of the axis of the vertical portion at an angle of about iifteen degrees, and it is provided at its junction with said vertical portion with a collar or annular enlargement 5, the upper face of which is level, while its lower face is beveled, the cone of bevel having its axis coincident with that of the inclined end g of the shaft 2. On the inclined shaft end plays loosely the bearingsocket 6, having at its upper end an exterior rim-flange 7, having outward and upward inclination corresponding to the bevel of the cone-face of the enlargement 5, which is provided usually with a keeper-screw, which serves to prevent the socket from falling off the inclined shaft end when the grindingplates are removed. The lower or concave grinding-plate has a central opening (indicated at 8) which provides for the discharge, the dress of this plate being from coarser peripheral teeth to finer teeth around this central opening. The upper or convex grindingplate, having a corresponding dress, is indicated at 9. This plate is provided with a hub portion l0, the bearing of which receives the socket 6 and loosely engages the same. This joint is spherical. In this construction, therefore, the lower grinding-plate remains stationary, but is adjustable to regulate the iineness of the grinding. The bent shaft rotates, carrying its inclined lower end around in a sweeping manner, so that it performs a revolution around-the vertical axis. A similar motion of the upper or convex grindingplate is effected, except that this plate is not positively rotated. Such rotation as is set up in this plate is automatic, being effected mainly by the grinding stress.

The feed-tube c is provided with a suitable hopper at its upper end and by its lower end IOO is connected to the rim-iiange of the terminal spout 11, which is connected to the upper portion of the bowl near its wall.

In this mill there is motion of reciprocation or translation as` Well as circular motion of the convex grinding-plate, so that in connection with the concave grinding-plate the feed-tube and is provided with passages of diiicerent size to permit diiicerent quantities of the grain to pass in accordance with the size of the passage adjusted to the mouth of said tube. This gate is shown of sector form, having passage-pockets of diierent size. It is attached to a shaft, which is designed to have an ordinary adjusting-arm in connection with a ratchet (not shown)lfor fixing the adjustment.

Having described this invention, what I claim, and desire to secure by Letters Patent, is-

l. In a grinding-machine, the combination j with an adjustable spherically-concave grinding-plate having a center discharge-opening, of the upper spherically-convex grindingplate, the vertical bearing of the frame,the bent shaft, its gear, andthe spherical jointsocket loosely engaging said bent shaft, substantially as specified.

2. In a grinding-machine, the combination with a frame and an adjustable sphericallyconcave lower grinding-plate attached thereto, of a bent shaft, and a spherically-convex upper grinding-plate loosely connected to said bent shaft by a'spherical joint-socket, substantially as specied.

3. In a grinding-machine, the combination with a frame and a detachable and adjustable spherically-concave lower grinding-plate, of a bent shaft, and a spherically-convex uppergrinding-plate loosely connected to the lower oblique portion of said bent shaft, substantially as specified.

4. In a grinding-machine, the combination with an open-bottom frame, and a detachable lower concave grinding-plate, in connection therewith of a convex upper grindingplate, the iianged spherical socket and the in- 1(Callired conical collar, substantially as speci- 5. A grinding-machine, consisting of the open-bottom frame bent shaft, and gearing, the detachable and adjustable sphericallyconcave center discharge lower grindingplate, the spherically-convex upper grindingplate, the peripheral feed, and the adjustable feed-gate, substantially as specified In testimony whereof I affix my signature in presence oi twc` witnesses.

'.{HARRIET A. HIGBEIG. 

